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  1. Lucien Nunes

    Multiple COM wires slipping from light switch

    A general requirement for all electrical work is to make good, secure, reliable connections using appropriate materials. There should never be the slightest doubt about the fit of the conductors in the terminals or their suitability for the purpose. Wago 221's are nice, compact, versatile lever...
  2. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    I don't know. I'll record it off-air but it would be nice to get a source version that has not been through the ghastly DVB-T compression for broadcast. Will check with the production team.
  3. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    Update: MEET interview will be broadcast on BBC Breakfast next Tuesday May 2nd. We don't know what time, probably between 06:00 and 09:15. Stay tuned!
  4. Lucien Nunes

    Consumer unit install in a camper van.

    Obviously the RCBO protecting the inlet to the MultPlus is independent of the RCBOs on its output, which effectively have a different source of supply (the MultiPlus itself.) So that first RCBO is not really part of the distribution board which splits the MultiPlus output to the three final...
  5. Lucien Nunes

    Temporary supply TT earthing

    Leaving all the various regs e.g. BS7375 aside for the moment, this doesn't follow logically IMO. Over a large PME system, the many local earth electrodes back each other up and provide a distributed low-impedance connection from the CNE to real earth. But if failure of the incoming CNE to the...
  6. Lucien Nunes

    Cooker Socket showing 3 volts when off

    That's probably capacitive coupling from the appliance gridswitch feed cable to the cooker cable, if the two run side-by-side for some distance. When a conductor is completely isolated, as would be the line core of the cooker cable when both the MCB and the isolator are switched off, it can take...
  7. Lucien Nunes

    Does anyone know what RCD fault he is talking about

    I agree, you can't disconnect a measurement. He was trying to be cryptic and avoid saying the word 'neutral', perhaps so that he couldn't be accused of explicitly suggesting a dodgy method. I think he knows his job but what a lot of waffle! I could have said that with 75% less words. As a few...
  8. Lucien Nunes

    UK Advice on this incomer please

    I don't recognise it, perhaps there is a maker's name on the cover? I think there is an important part missing: See the diagonal slots in the bakelite near the terminal screws? IMO there should be a ceramic or Sindanyo tube across the middle that slots in there, through which the fuse wire is...
  9. Lucien Nunes

    Does anyone know what RCD fault he is talking about

    I can't make any sense of that either and I don't think there's a single guaranteed way to find any kind of fault that would cause an RCD trip. But I do agree that a lot of people make heavy going of finding some types of faults because they don't think carefully enough about cause and effect or...
  10. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    I'm delighted to announce that some time in the next few days / weeks, BBC Breakfast will be airing a short piece about MEET (The Museum of Electrical and Electronic Technology.) I'm expecting it to include an interview in which I explain our original plan and the impact of my declining health...
  11. Lucien Nunes

    UK What is the IP rating for thisšŸ™ˆ

    I'm not clear on what they have done to the top of the CU. We can see the holes hacked in the intumescent strip laid on top, which is hiding the CU itself, but the general darkness suggests large holes underneath or even one big slot. Did they think that sticking the intumescent over the top...
  12. Lucien Nunes

    Cable Junction Under Floor Without Box

    Regardless of the location or type of terminals used, leaving them unenclosed has not been correct practice at any time in the last 100 years. As mentioned above, the cables need mechanical support so that no tension can be put on the connectors, and the basic insulation on the individual cores...
  13. Lucien Nunes

    car fuses automotive

    Standard ATO blade fuses are normally rated for 1000A breaking capacity at 32V DC maximum. Using them at mains voltage is little better than a very short piece of open fuse wire. The lack of silica powder that is part of every high breaking capacity mains fuse means that the arc will continue...
  14. Lucien Nunes

    Old unmarked appliance cable - core ident

    The machine will work fine with either polarity, but as mentioned there might be a preferred way round for the mains lead to put an SP power switch in the line. DP switches weren't unknown. The USA had a convention for terminal screws identified by metal colour. Copper = line; nickel plated =...
  15. Lucien Nunes

    Gfci wonā€™t work , wires are hot though.

    There is not enough information here to assist you, and the fact that you have taken some unsafe steps is of concern. If you are not sufficiently familiar with the correct procedure for tracing what appears to be a broken circuit, I would recommend engaging an electrician. Sorry that doesn't...
  16. Lucien Nunes

    Could somebody please tell me what the name of the below circuit is please

    It's a common-source amplifier, which can be identified by the input being applied to the gate and the output being taken from the drain. There's a lot more I could say but as already mentioned, it would be nice to know some context to these questions. We like to help, but now you know what to...
  17. Lucien Nunes

    Could somebody please help me understand this circuit?

    For which reason it's no longer generally used, and only normally for very low power. It was more common in the days of fully analogue electronics, and before simple, low-cost monolithic regulators and SMPSUs with inherently regulated output were the norm.
  18. Lucien Nunes

    Ideas for finding fault area in underground swa?

    A loop / bridge test will probably find the fault. TDR will probably find the joint and/or the fault if they are in different places. You might recall my Heath Robinson TDR setup that I wrote a thread about, using my laptop and an external VGA monitor when I didn't have an actual TDR instrument...
  19. Lucien Nunes

    The use of this -- in practice

    That trick only works if the cable is looped round the obstruction, not if it just passes behind / through it which seems a more likely scenario. It seems like only yesterday (although it's 27 years ago) that we were sitting having lunch when someone looked up and saw a cable that should not...
  20. Lucien Nunes

    Camper electrical question

    I can't explain it, other than that perhaps the polarity of the shoreline was always wrong (which would not have stopped it working) but now the neutral connection (to the hot prong) has broken away, so that the circuit is only complete when the missing neutral (on the hot breaker terminal) is...

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